henry



(NO MOdel.)

J.,A.'1VIOGRAW, G. W. MOGRAW', J1. 82: H. L. 85.

G. E. MOGRAW. H. L. MOGRAW, Administrator of J. A. MOGRAW, Deceased.

SORAPER BAR FOR COMPOSITE ROOFING MACHINES. NO. 422,609. Patented Mar. 4, 1890.

WITNESSES: INVENTORS! I MW!- UNIT D. STATES PATENT OFFICE.

JOHN A. MOGRAW, GEORGE WV. MCGRAWV, JR, HENRY L. MCGRAW, AND CHARLES EDWIN MOGRAW, OF ALLEGHENY, PENNSYLVANIA; HENRY L. MCGRAW ADMINISTRATOR OF JOHN A. MOGRAW', DECEASED.

SCRAPER-BAR FOR COMPOSITE-ROOFING MACHINES.

SPECIFICATION forming part of Letters Patent No. 422,609, dated March 4, 1890.

Application filed June 25, 1889. Serial No. 315,466. (No model.)

To all whom it may concern: papersheet'as it emerges from the latter.

Be it known that we, JOHN A. MCGRAW, In practicewe have found that for such pur- GEORGE W. MCGRAW, J r., HENRY L. MO- pose it is desirable to use a serrated or GRAW, and CHARLES EDWIN McGRAW, of toothed scraper-bar, in contact with which 5 Allegheny, in the county of Allegheny andv the paper passes, since such serrations, al-

State of Pennsylvania, have invented a new though removing efficiently the surplus liqand useful Improvement in Scraper-Bars for uid, leave sufficient remaining to cause the Composite Roofing Machines, of which the paper webs to adhere; but we have also found following is a full, clear, and exact descripthat as the temperature of the liquid varies 6o tion, reference being had to the accompanyat different times a scraper-bar having serraing drawings, forming part of this specifications of constant size and relative positions tion, in whichwill not at all times perform the work prop- Figure 1 is a vertical longitudinal section erly, since at one time it may remove more of of amachine provided with our improvement. the liquid than at others. To avoid this dif- 15 Fig. 2 is a plan view of a part. Fig. 3 isaverficulty, we have devised our present inventical cross-section on the line III III of Fig. 2. tion, which consists in an adjustable scraper- Fig. 4 is a vertical cross-section of a modifibar having peripheral grooves or serrations cation. of varying depth or number at different lines,

Like symbols of reference indicate like so thatby changing the line of the bar pre- 2o part-s in each. sented to the passing paper the eifective v In the drawings, 2 represents the roll from number and size of serrations may be varied. which the primary sheet or web of paper is This is illustrated in Fig. 2, in which the pedrawn. ripheral grooves are made tapering in depth,

3 is a tank containing melted asphaltum. and the bar is set in its hearings in the sides 25 4 are rollers partlyimmersed in the liquid, of the vat, so that it may be turned and over and incontact with which rollers the pathereby adjusted, as just explained. The per passes. same result may be had by making the bar 5 are rollers which serve to hold the paper as shown in Fig. 4, having several distinct in contact therewith. lines of serration, any one of which may be 3o 6 is the roll from which the second web of presented by turning the bar.

paper is drawn. We claim 7 7 are compressing-rollers, between which 1. The combination, with the vat for supthe webs are drawn for the purpose of uniting plying an adhesive substance to the sheet, of them together, and 8 is a smoothing or own an adjustable scraper-bar having serrations 3 5 pressing device for rubbing the sheet and varying at different lines of the bar,substansmoothing out the creases thereof. tially as and for the purposes described.

The paper is drawn through the machine 2. The combination, with the vat for supin the usual and well-known manner, and at plying an adhesive substance to the sheet, of the delivery end of the machine its surface is an adjustable scraper-bar having peripheral 40 preferably sanded by sand discharged from grooves tapering in depth, substantially as a suitable hopper 9. and for the purposes described.

The machine as thus described is substan- In testimony whereof we have hereunto set tially the same in construction as that shown our hands this 3d day of May, A. D. 1889. and described in a patent, No. 366,857, granted 45 to George WV. McGraw on July 19, 1887, and g fi ggA JR ifytxllisrefore not claimed herein specifically fiENRY L- MOGRAW.

Our invention consists in a scraper-bar 10 CHARLES EDWIL MCGRA of peculiar construction, arranged on the de- \Vitncsses:

5o livery side of the vat, for the purpose of re- THOMAS IV. BAKEWELL,

moving surplus asphaltum liquid from the WV. B. CORWIN. 

